Libitina
From The Elysium'verse Wiki
Libitina, strictly referred to as Libby, is One Half of the Collective Goddess of Reincarnation that's made up of her and her "sister" Chalasmos. Libby is very literally Chal’s actual conscience & superego, who was brought to life by Loki after existing as a hallucination in Chal's head... so it's easier to just say “twin sister.” Libby is a lovably adorable eldritch mystery entity (loosely probably a deity).
